Here is some information that I'd like to share (totally based on my personal knowledge).
Pak. local companies have found the different ways of marketing to sell their products (oils).
Now they see that imported cars are coming and people start asking what is synthetic oils. So they have make different formulas for us to pull more money from our pockets.
Examples
If local oil is 5% Synthetic and 95 regular, but company can advertise or write it as "Synthetic Oil". And people will buy it by considering its Synthetic oil. Whereas its only 5% synthetic. But who knows this fact ??
If the oil is 10% Synthetic and 90 regular, the company can advertise or writ it as "Synthetic Oil". And people will buy it by considering its Synthetic oil. Whereas its only 10% synthetic. But who knows this fact ??
SIMILARLY, DIFFERENT COMPANIES USING DIFFERENT TERMINOLOGIES TO ATTRACT CUSTOMERS.
Now,
If we are living in US/Canad then just use fully synthetic oil of Mobil-1 and run our car upto 20K literally & blindly and without any doubt.
And If we use same oil (mobil-1 of made in USA) in Pak. then we can drive upto 18~20K also. Without having the fear of any internal engine damage. Conditionally oil filter has to be changed after every 5K max.
But whats happening in Pak.
Hav*line Synthetic oil mileage is 5K (most usual)
Sh*ll's synthetic oil mileage is 6K (most usual)
C*ltex's synthetic oil mileage is 4.5K (most usual)
Z*C's synthetic oil mileage is 8K (most usual)
Performa's synthetic oil mileage is 6K (most usual)
Etc.
Etc.
Etc.
So, we never know that which oil has what percentage of synthetic portion !!!
Reason
Original fully synthetic oil of Mobil-1 (made in USA) is tentatively Rs. 1500~1800/L (If any doubt then check it from Amazon.com)
Whereas the synthetic oils available in Pakistan are Rs. 550~700/L
I believe this information would be quite enough for us to choose exact company & oil.
All the best